anyone put a root in pipe with 7016?

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got a riddle in my head for ever!i did 10" schedule 100 ore more 6G pipe in the mid 80's in  a yard that made oil rigs for the north sea.I had a time out from welding for a long time.now i just cant accept that we put our root in back then with 6010.our root went in a 1/8" gap with a 1/8" land (i still have "some" memory)our roots went in real slow, soft and we weaved it along the edge whilst holding a tight arc....might even have pushed a bit.But it wasnt like the fiery arc of 6010 which seems to be the standard root for this (USA) country.We might have changed polarity to  DCEN (i guess) for the root.any help appreciatedG
Reply:never heard of using that rod for roots in pipe. honestly ive never ran that rod either, ive heard of it though. low hydrogen root fill and cover is used. seems like for the most part people use high cellulose for root and sometimes for hot pass as well. then 7018 for the remainder of the joint. but the method ive seen the most of is 6010 root 7018 for the remainder of the joint. ive heard mig welding of pipe is starting to take off. which i think is great! short circuiting and pulsed spray, ive heard of them doing it both ways or a combo of the two. you cant match the speed and the user friendly appeal of mig. ive often wondered why backing or chill rings havent been used more. backing ring with 7018 sounds like it would produce miles of pipe faster. if there are worries or restriction, they dont have to be very thick. this would eliminate bad root welds too. what do i know though im just a dumba$$ welder....only thing worse than an ugly woman is an ugly weld
Reply:European standards are much different from North America.  The common electrode is rutile based much like our 6013.  E 7016 is a low hydrogen rod with potassium that can be used on AC if required.  The flux is minimal and easily handled in a root allowing reasonable success doing open roots.  I have done plate open root qualifications in all positions over thirty years ago using E 7018, 3/32 dia. and electrode negative.  The fit had to be perfect.  The plate was finished with 1/8 inch E 7018 on electrode positive.  E 7016 is rare as hen's teeth in these parts however the flux is very similar to what is used on most stainless steel electrodes.  In the end someone figures out a procedure and  tests it out then welders qualify on that procedure because that is what they did before.  It is costly to change a procedure in terms of testing and proving that it is practical.  It also must be acceptable to the engineers concerned.  E 7016 would be a good choice if you wanted a low hydrogen root.
Reply:a week ago I bought E 7016 stick
Reply:I realize this is an old thread. Goldfraser, I've been putting in roots for a company using 7016. As far as I know duke energy, now known as DCP has been using this procedure since early 80's
Reply:In Australia we use them rods all the time, they are the main electrode along with 12 and 13's.  7018 and 6010 etc are not a real common rod to use, we run them usually on dc + or Ac.
Reply:7018's have been common on some of the jobs ive been on in OZ.
Reply:I think that with low hydrogen rods on an open root you can run the risk of sucking in some atmosphere from the back and wind up with hydrogen embrittlement. I have run some open root outside corner welds and broken them and found that the 7018 root pass was scattered with small air pockets. It was explained to me that the rod will suck up air from the back of the joint. Leaving what it could not expell (hydrogen) from the weld puddle.
Reply:7016 runs quite well for a root. It has better wind and air containmination resistance imo than 7018. As long you feather tacks about like tig tie ins are easy and trick is go nice and slow on low amps.
Reply:In open root pipe how could you get air contamination on the Root sideIf there is always slag on the same root side after it's cooled?G
Reply:Right. I meant just it handles a breeze a little better than good ole low hy
Reply:Originally Posted by HCFI think that with low hydrogen rods on an open root you can run the risk of sucking in some atmosphere from the back and wind up with hydrogen embrittlement. I have run some open root outside corner welds and broken them and found that the 7018 root pass was scattered with small air pockets. It was explained to me that the rod will suck up air from the back of the joint. Leaving what it could not expell (hydrogen) from the weld puddle.